Apparently the deal is for 3 games, the first of which will be a multiplayer open world game, which I'd guess means that they are planning something similar to Conan Exiles.

Funcom has entered into an exclusive partnership with Legendary Studios to develop games based on the works of Frank Herbert’s DUNE, one of the world’s best known science fiction universes with multiple adaptations into movies, games and other media.

This is a six year partnership to release at least three titles on the PC/Console platforms, with one of the games planned to be in the “Open World Multiplayer” genre that will enter into pre-production in Funcom’s Oslo studio during 2019.

Entering into this partnership is in line with the company’s strategy of working with strong Intellectual Properties, allowing for two different vast and well known universes – CONAN and DUNE – to be available for the Company’s games.

Time and tide melt the snowman.

There are worlds out there where the sky is burning, where the sea's asleep and the rivers dream, people made of smoke and cities made of song. Somewhere there's danger, somewhere there's injustice and somewhere else the tea is getting cold. Come on, Ace, we've got work to do.
-- The Doctor